The sermon centers on the profound significance of Jesus' final words on the cross—'It is finished'—as the climactic fulfillment of God's eternal plan to redeem humanity. It emphasizes that Christ, as both divine and human, completed the work of salvation by enduring God's wrath, fulfilling all Old Testament prophecies, and offering Himself as the perfect, once-for-all sacrifice, thereby abolishing the need for ceremonial sacrifices and opening direct access to God. The message underscores that salvation is not achieved through human effort but rests entirely on Christ's finished work, which reconciles sinners to God, establishes a new covenant, and secures eternal life for all who believe. The preacher calls listeners to abandon reliance on personal righteousness and instead trust fully in Christ's completed atonement, finding rest, peace, and assurance in His victory over sin, death, and the law.